创建用户认证授权的 kubeconfig 文件
当我们安装好集群后，如果想要把 kubectl 命令交给用户使用，就不得不对用户的身份进行认证和对其权限做出限制。
下面以创建一个 cby 用户并将其绑定到 cby 和 chenby 的 namespace 为例说明。
创建生成证书配置文件
代码语言：shell复制详细见：https://github.com/cby-chen/Kubernetes#23创建证书相关文件
cat > ca-config.json << EOF
{
"signing": {
"default": {
"expiry": "876000h"
},
"profiles": {
"kubernetes": {
"usages": [
"signing",
"key encipherment",
"server auth",
"client auth"
],
"expiry": "876000h"
}
}
}
}
EOF
cat > cby-csr.json << EOF
{
"CN": "cby",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "system:masters",
"OU": "Kubernetes-manual"
}
]
}
EOF生成 CA 证书和私钥
代码语言：shell复制cfssl gencert
-ca=/etc/kubernetes/pki/ca.pem
-ca-key=/etc/kubernetes/pki/ca-key.pem
-config=ca-config.json
-profile=kubernetes
cby-csr.json | cfssljson -bare /etc/kubernetes/pki/cby
ll /etc/kubernetes/pki/cby*
-rw-r--r-- 1 root root 1021 May 25 17:36 /etc/kubernetes/pki/cby.csr
-rw------- 1 root root 1679 May 25 17:36 /etc/kubernetes/pki/cby-key.pem
-rw-r--r-- 1 root root 1440 May 25 17:36 /etc/kubernetes/pki/cby.pem创建 kubeconfig 文件
代码语言：shell复制kubectl config set-cluster kubernetes
--certificate-authority=/etc/kubernetes/pki/ca.pem
--embed-certs=true
--server=https://10.0.0.89:8443
--kubeconfig=/etc/kubernetes/cby.kubeconfig
kubectl config set-credentials cby
--client-certificate=/etc/kubernetes/pki/cby.pem
--client-key=/etc/kubernetes/pki/cby-key.pem
--embed-certs=true
--kubeconfig=/etc/kubernetes/cby.kubeconfig
kubectl config set-context cby@kubernetes
--cluster=kubernetes
--user=cby
--kubeconfig=/etc/kubernetes/cby.kubeconfig
kubectl config use-context cby@kubernetes --kubeconfig=/etc/kubernetes/cby.kubeconfig添加用户并将配置其用户
代码语言：shell复制useradd cby
su - cby
mkdir .kube/
exit
cp /etc/kubernetes/cby.kubeconfig /home/cby/.kube/config
chown cby.cby /home/cby/.kube/configRoleBinding
需要使用 RBAC创建角色绑定以将该用户的行为限制在某个或某几个 namespace 空间范围内
代码语言：shell复制kubectl create namespace cby
kubectl create namespace chenby
kubectl create rolebinding cby --clusterrole=cluster-admin --user=cby --namespace=cby
kubectl create rolebinding cby --clusterrole=cluster-admin --user=cby --namespace=chenby
kubectl describe -n chenby rolebindings.rbac.authorization.k8s.io cby
Name: cby
Labels: <none>
Annotations: <none>
Role:
Kind: ClusterRole
Name: cluster-admin
Subjects:
Kind Name Namespace
---- ---- ---------
User cby
kubectl describe -n cby rolebindings.rbac.authorization.k8s.io cby
Name: cby
Labels: <none>
Annotations: <none>
Role:
Kind: ClusterRole
Name: cluster-admin
Subjects:
Kind Name Namespace
---- ---- ---------
User cby
su - cby获取当前的 context
代码语言：shell复制kubectl config get-contexts
CURRENT NAME CLUSTER AUTHINFO NAMESPACE
* kubernetes-cby@kubernetes kubernetes kubernetes-cby cby无法访问 default namespace
代码语言：shell复制[cby@k8s-master01 ~]$ kubectl get pods --namespace default
Error from server (Forbidden): pods is forbidden: User "cby" cannot list resource "pods" in API group "" in the namespace "default"
[cby@k8s-master01 ~]$ 可以访问 cby namespace
这样 cby 用户对 cby 和 chenby 两个 namespace 具有完全访问权限。
代码语言：shell复制[cby@k8s-master01 ~]$ kubectl get pods --namespace cby
No resources found in cby namespace.
[cby@k8s-master01 ~]$ kubectl get pods --namespace chenby
No resources found in chenby namespace.https://www.oiox.cn/
https://www.chenby.cn/
https://cby-chen.github.io/
https://blog.csdn.net/qq_33921750
https://my.oschina.net/u/3981543
https://www.zhihu.com/people/chen-bu-yun-2
https://segmentfault.com/u/hppyvyv6/articles
https://juejin.cn/user/3315782802482007
https://cloud.tencent.com/developer/column/93230
https://www.jianshu.com/u/0f894314ae2c
https://www.toutiao.com/c/user/token/MS4wLjABAAAAeqOrhjsoRZSj7iBJbjLJyMwYT5D0mLOgCoo4pEmpr4A/
CSDN、GitHub、知乎、开源中国、思否、掘金、简书、腾讯云、今日头条、个人博客、全网可搜《小陈运维》
文章主要发布于微信公众号：《Linux运维交流社区》
